Czasopismo | INŻYNIERIA MATERIAŁOWA | Rocznik 2013 - zeszyt 4

Application of Gurson-Tvergaard-Needelman function to modelling of plastic deformation in ductile iron with a ferritic matrix

nr katalogowy: 79731

Among all casting alloys, ductile iron is one of the most commonly used structural materials, offering very good casting and mechanical properties. Due to its high toughness (elongation above 20%), this material is often used for the responsible cast parts of machines operating in the automotive and energy sectors of the industry, where castings of highly diverse mass and wall thickness are subjected to the effect of varying loads. The scope of application of ductile iron requires deeper understanding of the mechanism of its decohesion, based on the experimental studies that go beyond the typical mechanical tests and numerical analysis of an impact of the spatial state of stress on the strength properties of this material. Due to the fact that in terms of its mechanical behaviour, cast iron is considered to be a two-phase system with different physical properties, the use of a constitutive relationship interrelating both stress and strain in a linear equation and of the Huber-Mises-Hencky (HMH) hypothesis as a measure of effort is a too far-reaching simplification, especially when the impact of heavy loads, which may cause local plastic deformation, is taken into account. In this study, an attempt to analyse the state of stress and its impact on the phenomenon of decohesion of ductile iron with a ferritic matrix at a level of the grain size and in "macro" scale, using for this purpose a modified Gurson-Tvergaard-Needelman plasticity function (GTN) was made. The stress and strain analysis, carried out by FEM in an Abaqus v.11 programme in the vicinity of a graphite precipitate, has provided information on the effect that voids may have on the crack initiation and propagation in a matrix and enabled the determination of the critical value fCR of the void volume fraction in the GTN model for different levels of graphite content. MATERIAL The stress and strain analysis was carried out adopting the physical properties of EN-GJS-4[...]

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